This article focuses on how to perform exterior wall insulation foam on the choice of other ways of warming here. Here are answers to basic questions that arise when performing this work, as well as detailed instructions on how to use styrofoam for insulation of the walls of the House from the outside. The same recommendations, how to prepare a wall surface for the installation of insulation, foam mounting options, and how to perform finishing work on the surface of the heater.
Surface preparation the wall House
Thermal insulation of walls from the outside foam requires appropriate surface preparation. Originally the wall surface can have various defects and roughness. The purpose of this phase of preparation-align surface. If this is not done, then during operation, you may experience many problems. For example, if you have a void under a sheet of foam this plot does not have sufficient strength and in case of mechanical stress in this place the insulating material is deformed. A similar situation will arise and, if under a sheet of foam would be a ledge. All of these require prior alignment that would surface roughness not to exceed 10-20 mm.
Has a value not only the flatness of the outer surface of the wall, and its adhesive properties, i.e. durability of connection with gluing structure.
Painted walls require special attention. If the paint is behind the façade, it must be smoothed out. When using paint type PF should knock. Further, we recommend that you apply the primer. In some cases, it is possible to avoid this phase surface preparation, for example, in the case of quality solid foundations. But the primer not only increases the strength of the surface layer, but also substantially increases the adhesion, which is beneficial during operation. With this in mind, not worth saving on the dirt road, their acquisition costs and will pay off in the future.
Before applying the primer it is recommended to check the condition of the wall surface. If there is sapping surface layer, it needs a preliminary clean-up. If the trimming does not give the desired effect and sapping continues, it is recommended that application of plaster or PuTTY, which added PVA glue. But in this case it is better to apply a first coat of spray. After drying on a wall put primer. For application use regular paint brush or spray. Brushing helps further clean the surface, however, if the strength of the surface layer of insufficiently high, it is better to use a spray bottle.
Features of preparation of extruded polystyrene (EPPS)
For manufacturing foam used various synthetic materials, including styrofoam extruded (EPPS). EPPS sheets have a very smooth surface, which requires additional training. To do this, use needle roller for drywall.
The platen rolled several times on the surface, thereby ensuring the necessary degree of roughness. It is much more convenient than to cause furrows Office or mounting the knife. Some manufacturers produce sheets EPPS pricked, but they are not always available. Before the beginning of works on installation of sheets of styrofoam on the wall you want to prepare the required amount of material, in the process of pasting occur downtime. Sheets of foam handle roller with two sides. Except for needle roller can be used and a metal brush with great rigidity. Other types of foam plastic have a sufficient degree of roughness and don’t need this preparation.
Mounting plates (external window sills) and insulation of slopes
Works on installation, insulation and finishing of slopes from the outside you should perform prior to installing the heater on the wall. Fastening of external window sills is going directly to window units. On their outer profile has special notches for installation. When you select the width of the sill, it must be understood that the work will be carried out later on the insulation of the outer surface of the wall. The stem is made from calculating the thickness of the insulating material plus 10 mm. Tide should extend beyond the edge of the wall at 30-40 mm. With less length rain will flood wall, and at greater length big fuss arises due to drops of rain. For example, at a thickness of heat insulation layer 50 mm external window sill should extend beyond the edge of the wall within 100 mm (1 cm + 5 cm + 4 cm).
In some cases, when you install the window plastic Starter rectangular profile. This installation under window sill formed cavity. If its not patched, then there will be formed and accumulate condensate, which will become numb under a layer of insulation or inside the House.
Cavity needs to be repaired. To do this, use different materials: plaster, adhesive mixture, etc., it is best to use for this foam, which can be easily cut to fit the size and shape of the cavity. This will create the base for installation of the external window sill. On installation it is better to make a small layer of foam. This will ensure a better connection and reduce noise during rain. After installation of outflow on mounting foam on it you want to put any load of approximately 3:0, while the foam will harden and ceased to grow. The protective film covering the front surface, leave and removed only after finishing all construction and finishing works.
The distance between the window and the installation aminoplast tides start warming of window slopes from the outside. Usually the size of a window aperture is less than the 20-30 mm. This gives for installation of insulation and the subsequent finishing. For insulation of slopes apply foam, has a less thick than that used for the insulation of facades. The thickness of the foam is chosen in view of the fact that approximately 10 mm will take on layers of finish. Further insulation on the slopes of the need to reconcile with thermal insulation façade. Ensure that the connection is possible, if the insulation on the slopes would be in favour of external wall not less than 10 mm.
Heater installation on facade of gluing method
Setting the windowed ebb and slopes, moving to install insulation on façade. Provides two options for fixing foam on the outer surface of the wall. Foam paste and fix mechanical fasteners. Combining these methods allows you to securely install the fixing insulation material on the façade that justifies itself in further exploitation.
Foam start to stick on the bottom. To do this, first set the start bar, which is the basis for binding sheets of styrofoam. If make installation without starting planks, then pasted the heater may shift. Such advances on wall surface can be up to 100 mm. Home Strip is a pillar for the first row of pasted sheets and prevent their displacement on plane.
Glue put two: the smallest width of 80-100 mm and larger, up to 200 mm. Small spatula adhesive composition and put on a big. If the roughness of the outer surface of the wall does not exceed 10 mm for application use a putty knife with teeth. Gluing structure stack comb with wavy profile. If the wall has large bumps, then gluing structure cover on the wall, as it is doing in the preliminary drawing of plaster, with glue put not on the sheet, and on the surface of the wall. This coating will ensure a more even distribution of glue on the surface and is guaranteed all existing irregularities and elevation changes. In addition, a sheet of foam after applying the adhesive becomes harder to several kilograms, that creates problems.
On the wall with large roughness is better not turn evenly across the surface of the adhesive and cause individual large blotches. Usually, each sheet cover 9 (eight on the perimeter and one Center). However, the number and size is determined by the status of site specific wall. The important thing is to ensure complete filling of the irregularities and smoothing between the wall and the sheet of foam.
In some cases, if you have very large protrusions in the foam makes the notch of the appropriate size. After drawing on a wall surface gluing structure foam sheet and press. For more dense connection and distribute the glue is recommended to gently knock on the worksheet. This is best done with the Palm, so as not to damage the foam and not leave on its obverse surface of dents.
Feature is stacking sheets of EPPS, made with a quarter. The presence of a quarter sheets EPPS allows almost completely avoid cold bridges and provides a more compact and reliable connection.
The disadvantage of EPPS may be considered a more smooth surface, which requires additional processing of needle roller for better adhesion, as well as difficulty adjusting when laying on the segments of the wall with large overhangs. Foam sheets are recommended to be stacked in staggered to formed t-shaped joints.
Further work with thermal insulation are encouraged to start no earlier than 3 days after the completion of works on his vilification. During this time the gluing structure completely will harden, usadet and adopt the final dimensions. However, when carrying out works independently of such a technological break happens naturally. When will the last leaf pasted heat-insulating material, it will be possible to begin work at the primary site.
However, it is necessary to use a slightly different sequence of works. This is due to the fact that the gluing of foam comes in two layers: top and bottom, with the top-tier requires mounting the scaffold. In order to reduce the number of movements of scaffolds is recommended to mount the foam patches, gradually moving scaffolds along the perimeter. This not only significantly reduce the labor intensity and timing of insulating and finishing works, but will also reduce the time spent by the foam when it is unprotected from the Sun’s rays. Styrofoam biodegradable on exposure to ultraviolet light and it is not recommended to keep for a long time under the open Sun. Of course, if this scheme works will need to dock separate areas but subject to certain rules and requirements should be no complications. Lot size will be determined by the width of the stage.
Fixing the foam mechanical fasteners
After gluing structure will harden, you can begin to foam. This typically has three days. During this time, the glue will harden is guaranteed, regardless of weather conditions. If you start drilling a hole in the foam to the hardening of the glue, sheets may be left behind from the wall. In addition, while gluing structure is not formed under the sheets flat and solid foundations on which there is a risk to get fasteners in emptiness and flexing the sheet. In this case, you will have to spend extra time and fasteners for alignment.
Glued sheet fix fungi that constitute plastic hat that has a large diameter sleeve into which the nail is inserted. Nails can be plastic or metal. Metal nail stronger, however, it is recommended to use the plastic fasteners, because it does not create additional cold bridge. In addition, metal fasteners are somewhat more expensive, with the plastic nails provide a sufficiently reliable connection. When choosing fasteners should pay attention to its quality. It’s not worth it especially saving. Cheaper fixtures, tends to be poor. He can bend or break.
Selecting plot, start drilling. For this purpose use the hammer drill and drill with a diameter of 10 mm. The hole should be 2 cm more than the length of the fungus. to do when drilling and clogging debris not let secure. The length of the fungus are chosen based on the size of the heater. As well as take into account the thickness of the other layers and add 4-5 cm to the wall fixation. Insulation thickness 50 mm length of the fungus should be 110 mm (1 cm + 5 cm + 5 cm), and the length of the holes for the installation of mildew, respectively 130 mm (11 cm + 2 cm).
Location fixing fungi
At the corners of the sheet of hammer in four attacks, and the fifth in the Center. This scheme (version 1, see figure) of a fungus provides optimal fixation. However, in some cases, you can use and a greater number of fasteners, which depends on specific conditions. This scheme (option 2 in the figure) the location of the entire joint and pre-loads fungi makes a connection with the wall sheet more dense and smooth.
The use of mechanical fastener allows for reliable fixation. Setting the first Fungus in the center of the sheet, it becomes apparent where there were irregularities. Speakers edge fix other fungi. If the start record on the fresh adhesive sheet can significantly deviate from the wall surface and uniformity of the connection will be broken. That is why the fungi begin to install once the glue hardens. Regardless of the layout and number of fasteners on a leaf fungus nail at a distance of 50-100 mm from the edge or corner of the sheet.
Installation of the fungus is made as follows. At first bore through all the holes, then into them insert plastic cap with legs, and then hammer in nails. Hat with legs, you can insert hands, but it is better to use a hammer, carefully pocketing them hats in the insulation. Hat you want scored so that it is level with the top surface of the insulating material. If you set a hat till the end you can’t-this means that the hole is not drilled until the end, or the diameter of the hole is not sufficient. In this case it is recommended to change the drill and drill a hole again, and then paste the fungus.
Setting on the selected site all CAP fungi, start plugging nails. While the CAP can move a bit to the inside of the sheet. Properly hammered fungus should be approximately 1-2 mm drowned in layer insulation. If a nail was unable to finish until the end by about 1 cm, then it cut off or bite.
How to handle joints
After all the sheets fastened fungi, transferred to processing of joints. To do this, view all joints to stretch and note places where the gap is greater than 5 mm. Usually such defect occurs when uneven walls. Such places close up foam. If there are cracks in the thickness of 20 mm or more, we recommend that you first paste the cut-to-size pieces of insulation, and then zapenit′. The foam dries up in a few hours, after which its surpluses cut off mounting blade. If joints perform at the General level, they line the special grater for styrofoam.
Float allows you to remove existing tabs on joints and level surface. When you use the grater EPPS cannot effectively eliminate unevenness. For the alignment of joints of sheets it is recommended that you use the EPPS mounting the knife or align with the subsequent finishing.
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